Beecht



ITED S'ra'rns nN'r rricnt HEINRICH VOLLBREGHT AND CARL MENSGHING, OF BUFFALO, NEW? YORK, ASSIGNORS TO THE SGHOELLKOPF ANILINE AND CHEMICAL COMPANY,

OF SAME PLACE.

RED COLORING-MATTER FROM ALPHA DlAZO BETA-NAPHTHYLAMINE SULPHCNlC AClD.

SPECIFICATION forming part of Letters Patent No. 356.672, dated January 25, 1887.

Application filed January 27, 1886. Serial No. 189,929, (Specimens) To aZZ whom it 17mg concern.-

Be it known that we, HEINRICH VOLL- nnnonr and CARL Mnnscninor, both of the city of Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Dye-Stuffs, of which the following is a specification.

Our invention relates to a new dye-stuff, which results from the reaction of beta-naphthol with alpha diazonaphthaline nionosulphonic acid.

In producing this acid we proceed as follows: We mix one hundred part-shy weight-,of the lime salt of alpha naphthaline monosulphonic acid, which acid is made in the usual manner, with two hundred parts of sulphuric acid of 66 Bauln. Vie then add to this mixture slowly forty-five parts of nitric acid of 40 Bauin at a temperature of from 90 to 100 centigrade, whereby two nitro monosulphonic acids are formed. These acids are converted into their amido compounds by any suitable and well-known method which conversion results in two naphthyla-mine sulphonic acids. These last two acids are easily separated, owing to the unequal solubility of their salts in water. The naphthylamiue sulphonic acid, which forms a sodium salt which is easily soluble in water is used for produc ing our new dye-stuff, which we call Brilliant Red. This last-mentioned acid has never been used to prepare dye-stuffs directly.

Vle prepare our new dye-stuff as follows: lVe mix two hundred and twenty-three pounds of the above-described naphthylarnine sulphonic acid with about two thousand pounds of water and three hundred and eighty pounds of hydrochloric acid of 20 Baum. \Ve cool the mixture so prepared to from 4 to 6 centigrade and pour into it slowly eighty pounds of sodium nitrite dissolved in two hundred pounds of water. The mixture is now left at rest for several hours-that is to say, until the naphthylamine sulphonic acidis convertedinto diazonaphthaline sulphonic acid. \Ve next slowly pour this diazo compound into a solution of one hundred and forty-four pounds of beta -naphthol dissolved in three hundred pounds of caustic soda of fifteen per cent. strength.

The dye-stuff is formed as shown by the following formula.

The new dye-stud is purified by crystallization in a well-known manner.

Our new dye-stuff is a brilliant red, which is lighter and of a more yellowish shade than the well-known Rocelline or fast red. The last-narned dye-stuff is produced from the naphthylamine sulphonic acid known as Pirizis, which differs materially from the naphthylamine sul phonic acid which we use in producing our dye'stuff. Vhen both naphthylamine sulphonic acids (ours and Pirias) are converted into naphthol sulphonic acids, two different acids are obtained. Rocelline, when treated with sulphuric acid of 66 Bauin, dissolves to a solution of a blue color, while the same solution of our new dye stuff produces a red violet.

We claim as our invention.

As a new product, the dyestuif or coloringmatter which results from the reaction of the diazo compound of the above-described naphthylamine sulphonic acid with betamaphthol, substantially as set forth.

Witness our hands this 23d day of January, 1886.

H. VOLLBREOHT. G. MENSCHING.

W'itnesses:

EDWARD WILHELM, Oscar: SOHAUB. 

